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SUMMARY:Controlling nuclear spins in quantum dots - Dr Jake Taylor
DTSTART:20090417T100000Z
DTEND:20090417T120000Z
UID:TALK17954@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:Advances in our ability to control electron spins in a double 
 quantum  \ndot allow for the experimental manipulation of a mesoscopic ens
 emble  \nof nuclear spins.  As interaction of these nuclear spins with oth
 er  \ndegrees of freedom are extremely weak\, such control can be used to 
  \ndrive nuclear spins far out of equilibrium.  At the simplest level\,  \
 nnuclear spins can be efficiently polarized\, and I will describe  \ntheor
 etical and experimental advances in our understanding of this  \neffect.  
 More curiously\, I will also report on a natural feedback  \nmechanism tha
 t leads to the formation of stable "dark" configurations  \nof nuclear spi
 ns.  These dark states no longer interact strongly with  \nthe electron sp
 in and dramatically reduce the inhomogeneous broadening  \nin the system\,
  resulting in an increase in $T_2^*$ from 20 to 900  \nnanoseconds.\n
LOCATION:HEP Seminar Room (980) Rutherford Building\, Cavendish Laboratory
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